Couldn't find a simple ‘print and go’ model for large spools so I made this one. it's way too sturdy at 16.9oz (current slicer settings) so feel free to drop the infill or wall count.
I have only tested it on Polymaker's 3KG spool but it works great and there is no drag/extrusion issues. Ready to be used out of the printer.
NOTE: Works great for regular spools too